69478991 has 8 divisors (see below), whose sum is σ = 74139120. Its totient is φ = 64919232.

The previous prime is 69478987. The next prime is 69479023. The reversal of 69478991 is 19987496.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 69478991 - 2² = 69478987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69478961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23660 + ... + 26433.

It is an arithmetic number, because the mean of its divisors is an integer number (9267390).

Almost surely, 2^69478991 is an apocalyptic number.

69478991 is a deficient number, since it is larger than the sum of its proper divisors (4660129).

69478991 is a wasteful number, since it uses less digits than its factorization.

69478991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50185.

The product of its digits is 979776, while the sum is 53.

The square root of 69478991 is about 8335.4058689424. The cubic root of 69478991 is about 411.1034937284.

The spelling of 69478991 in words is "sixty-nine million, four hundred seventy-eight thousand, nine hundred ninety-one".